MIPS Support #24
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,289 @@ | ||
| use core::arch::asm; | ||
| use core::fmt; | ||
| use core::ops; | ||
| use gimli::{Register, MIPS}; | ||
|
|
||
| // Match DWARF_FRAME_REGISTERS in libgcc | ||
| pub const MAX_REG_RULES: usize = 188; | ||
|
|
||
| #[repr(C)] | ||
| #[derive(Clone, Default)] | ||
| pub struct Context { | ||
| pub gp: [usize; 32], | ||
| #[cfg(target_feature = "single-float")] | ||
| pub fp: [usize; 32], | ||
| } | ||
|
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||
| impl fmt::Debug for Context { | ||
| fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| let mut fmt = fmt.debug_struct("Context"); | ||
| for i in 0..=31 { | ||
| fmt.field(MIPS::register_name(Register(i as _)).unwrap(), &self.gp[i]); | ||
| } | ||
| #[cfg(target_feature = "single-float")] | ||
| for i in 0..=31 { | ||
| fmt.field( | ||
| MIPS::register_name(Register((i + 32) as _)).unwrap(), | ||
| &self.fp[i], | ||
| ); | ||
| } | ||
| fmt.finish() | ||
| } | ||
| } | ||
|
|
||
| impl ops::Index<Register> for Context { | ||
| type Output = usize; | ||
|
|
||
| fn index(&self, reg: Register) -> &usize { | ||
| match reg { | ||
| Register(0..=31) => &self.gp[reg.0 as usize], | ||
| #[cfg(target_feature = "single-float")] | ||
| Register(32..=63) => &self.fp[(reg.0 - 32) as usize], | ||
| _ => unimplemented!(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl ops::IndexMut<gimli::Register> for Context { | ||
| fn index_mut(&mut self, reg: Register) -> &mut usize { | ||
| match reg { | ||
| Register(0..=31) => &mut self.gp[reg.0 as usize], | ||
| #[cfg(target_feature = "single-float")] | ||
| Register(32..=63) => &mut self.fp[(reg.0 - 32) as usize], | ||
| _ => unimplemented!(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| macro_rules! code { | ||
| (save_gp) => { | ||
| " | ||
| sw $zero, 0x00($sp) | ||
| sw $s0, 0x40($sp) | ||
| sw $s1, 0x44($sp) | ||
| sw $s2, 0x48($sp) | ||
| sw $s3, 0x4C($sp) | ||
| sw $s4, 0x50($sp) | ||
| sw $s5, 0x54($sp) | ||
| sw $s6, 0x58($sp) | ||
| sw $s7, 0x5C($sp) | ||
| sw $k0, 0x68($sp) | ||
| sw $k1, 0x6C($sp) | ||
| sw $gp, 0x70($sp) | ||
| sw $t0, 0x74($sp) | ||
| sw $fp, 0x78($sp) | ||
| sw $ra, 0x7C($sp) | ||
| " | ||
| }; | ||
| (save_fp) => { | ||
| " | ||
| swc1 $f0, 0x80($sp) | ||
| swc1 $f1, 0x84($sp) | ||
| swc1 $f2, 0x88($sp) | ||
| swc1 $f3, 0x8C($sp) | ||
| swc1 $f4, 0x90($sp) | ||
| swc1 $f5, 0x94($sp) | ||
| swc1 $f6, 0x98($sp) | ||
| swc1 $f7, 0x9C($sp) | ||
| swc1 $f8, 0xA0($sp) | ||
| swc1 $f9, 0xA4($sp) | ||
| swc1 $f10, 0xA8($sp) | ||
| swc1 $f11, 0xAC($sp) | ||
| swc1 $f12, 0xB0($sp) | ||
| swc1 $f13, 0xB4($sp) | ||
| swc1 $f14, 0xB8($sp) | ||
| swc1 $f15, 0xBC($sp) | ||
| swc1 $f16, 0xC0($sp) | ||
| swc1 $f17, 0xC4($sp) | ||
| swc1 $f18, 0xC8($sp) | ||
| swc1 $f19, 0xCC($sp) | ||
| swc1 $f20, 0xD0($sp) | ||
| swc1 $f21, 0xD4($sp) | ||
| swc1 $f22, 0xD8($sp) | ||
| swc1 $f23, 0xDC($sp) | ||
| swc1 $f24, 0xE0($sp) | ||
| swc1 $f25, 0xE4($sp) | ||
| swc1 $f26, 0xE8($sp) | ||
| swc1 $f27, 0xEC($sp) | ||
| swc1 $f28, 0xF0($sp) | ||
| swc1 $f29, 0xF4($sp) | ||
| swc1 $f30, 0xF8($sp) | ||
| swc1 $f31, 0xFC($sp) | ||
| " | ||
| }; | ||
| (restore_gp) => { | ||
| " | ||
| lw $at, 0x04($a0) | ||
| lw $v0, 0x08($a0) | ||
| lw $v1, 0x0C($a0) | ||
| lw $a1, 0x14($a0) | ||
| lw $a2, 0x18($a0) | ||
| lw $a3, 0x1C($a0) | ||
| lw $t0, 0x20($a0) | ||
| lw $t1, 0x24($a0) | ||
| lw $t2, 0x28($a0) | ||
| lw $t3, 0x2C($a0) | ||
| lw $t4, 0x30($a0) | ||
| lw $t5, 0x34($a0) | ||
| lw $t6, 0x38($a0) | ||
| lw $t7, 0x3C($a0) | ||
| lw $s0, 0x40($a0) | ||
| lw $s1, 0x44($a0) | ||
| lw $s2, 0x48($a0) | ||
| lw $s3, 0x4C($a0) | ||
| lw $s4, 0x50($a0) | ||
| lw $s5, 0x54($a0) | ||
| lw $s6, 0x58($a0) | ||
| lw $s7, 0x5C($a0) | ||
| lw $t8, 0x60($a0) | ||
| lw $t9, 0x64($a0) | ||
|
There was a problem hiding this comment. Where is the restoring code for at, k0, k1, fp, sp? Also please arrange everything in offset order. There was a problem hiding this comment. For the storing/restoring I mostly copied the riscv as reference, and directly mapped calls where appropriate. I'll get this fixed up though, wasn't sure what registers are critical. :) There was a problem hiding this comment. All non-volatile registers need to be saved, and all registers need to be restored. |
||
| lw $k0, 0x68($a0) | ||
| lw $k1, 0x6C($a0) | ||
| lw $gp, 0x70($a0) | ||
| lw $sp, 0x74($a0) | ||
| lw $fp, 0x78($a0) | ||
| lw $ra, 0x7C($a0) | ||
| " | ||
| }; | ||
| (restore_fp) => { | ||
| " | ||
| lwc1 $f0, 0x80($a0) | ||
| lwc1 $f1, 0x84($a0) | ||
| lwc1 $f2, 0x88($a0) | ||
| lwc1 $f3, 0x8C($a0) | ||
| lwc1 $f4, 0x90($a0) | ||
| lwc1 $f5, 0x94($a0) | ||
| lwc1 $f6, 0x98($a0) | ||
| lwc1 $f7, 0x9C($a0) | ||
| lwc1 $f8, 0xA0($a0) | ||
| lwc1 $f9, 0xA4($a0) | ||
| lwc1 $f10, 0xA8($a0) | ||
| lwc1 $f11, 0xAC($a0) | ||
| lwc1 $f12, 0xB0($a0) | ||
| lwc1 $f13, 0xB4($a0) | ||
| lwc1 $f14, 0xB8($a0) | ||
| lwc1 $f15, 0xBC($a0) | ||
| lwc1 $f16, 0xC0($a0) | ||
| lwc1 $f17, 0xC4($a0) | ||
| lwc1 $f18, 0xC8($a0) | ||
| lwc1 $f19, 0xCC($a0) | ||
| lwc1 $f20, 0xD0($a0) | ||
| lwc1 $f21, 0xD4($a0) | ||
| lwc1 $f22, 0xD8($a0) | ||
| lwc1 $f23, 0xDC($a0) | ||
| lwc1 $f24, 0xE0($a0) | ||
| lwc1 $f25, 0xE4($a0) | ||
| lwc1 $f26, 0xE8($a0) | ||
| lwc1 $f27, 0xEC($a0) | ||
| lwc1 $f28, 0xF0($a0) | ||
| lwc1 $f29, 0xF4($a0) | ||
| lwc1 $f30, 0xF8($a0) | ||
| lwc1 $f31, 0xFC($a0) | ||
| " | ||
| }; | ||
| } | ||
|
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||
| #[naked] | ||
| pub extern "C-unwind" fn save_context(f: extern "C" fn(&mut Context, *mut ()), ptr: *mut ()) { | ||
| unsafe { | ||
| #[cfg(target_feature = "single-float")] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| move $t0, $sp | ||
| add $sp, $sp, -0x110 | ||
| sw $ra, 0x100($sp) | ||
| ", | ||
| code!(save_gp), | ||
| code!(save_fp), | ||
| " | ||
| move $t9, $a0 | ||
| move $a0, $sp | ||
| /* jalr must use $t9 in PIE code */ | ||
| jalr $t9 | ||
| nop | ||
| lw $ra, 0x100($sp) | ||
| add $sp, $sp, 0x110 | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| options(noreturn) | ||
| ); | ||
| #[cfg(not(target_feature = "single-float"))] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| move $t0, $sp | ||
| add $sp, $sp, -0x90 | ||
| sw $ra, 0x80($sp) | ||
| ", | ||
| code!(save_gp), | ||
| " | ||
| move $t9, $a0 | ||
| move $a0, $sp | ||
| /* jalr must use $t9 in PIE code */ | ||
| jalr $t9 | ||
| nop | ||
| lw $ra, 0x80($sp) | ||
| add $sp, $sp, 0x90 | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| options(noreturn) | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| pub unsafe extern "C" fn restore_context(ctx: &Context) -> ! { | ||
| unsafe { | ||
| #[cfg(target_feature = "single-float")] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| ", | ||
| code!(restore_fp), | ||
| code!(restore_gp), | ||
| " | ||
| lw $a0, 0x10($a0) | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| in("$4") ctx, | ||
| options(noreturn) | ||
| ); | ||
| #[cfg(not(target_feature = "single-float"))] | ||
| asm!( | ||
| " | ||
| .set noreorder | ||
| .set nomacro | ||
| .set noat | ||
| ", | ||
| code!(restore_gp), | ||
| " | ||
| lw $a0, 0x10($a0) | ||
| jr $ra | ||
| nop | ||
| .set at | ||
| .set macro | ||
| .set reorder | ||
| ", | ||
| in("$4") ctx, | ||
| options(noreturn) | ||
| ); | ||
| } | ||
| } | ||
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Where's the saving code for sp?
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Darn, I meant to move it and made a blunder, will fix
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This is not saving the correct sp. You have already clobbered it. It should be t0.